Numerical Simulation of Turbulent Diusive Combustion

GUTIERREZ MARCANTONI, LUIS; TAMAGNO, JOSÉ; ELASKAR, SERGIO

Córdoba

Congreso; IV CLAM, 2012 - Congreso Latinoamericano de Matemáticos; 2012

Universidad Nacional de Córdoba

In this paper it is shown how openFoam by means of an executable built like reactingFoam,can be applied to simulate a low speed, turbulent and rate controlled diusivecombustion process. Unsteady Favre's averaged reactive Navier-Stokes equations are solvedto describe the combustion gas dynamics, and to handle the turbulence a modied k-" modelis used. To model the nite rate chemistry only a global one step reaction is considered,and to account for chemistry-turbulence interactions the partially stirred reactor (PaSR)approach is implemented. A nite volume numerical simulation is accomplished by makinguse of available openFoam libraries in equations discretization schemes(fvSchemes) andsolution solvers (fvSolutions), and on pre and post data processing utilities. To solve thechemical reactions equations, a sti ODE solver is needed in every time step to determinespecies concentrations and corresponding source terms at the end of the time step. Thisis done using the semi-implicit solver of Bader and Deuhard. To improve convergenceand accuracy in solving the algebraic systems resulting from the discretizations, a pressureimplicit with splitting of operators (PISO) technique is used. A numerical simulation of thebenchmark known as Sandia Flame D, is compared with experimental data. The numericalresults and the experimental data are in fair agreement.